ineffective
/ˌɪn.ɪˈfɛk.tɪv/
Proposed by a contributor, not yet supported by evidence.
Sense 1
Meaning · English
Not having the desired effect; ineffectual; otiose.
Adjective
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Sense 2
Meaning · English
Lacking in ability; incompetent or inadequate.
Adjective
Examples
Fire ants circumvented the problem of an ineffective sting by having an unusual and highly effective venom that when daubed or sprayed on other ants penetrates their waxy protective integumental barrier and kills or disables them.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Common questions
What does “ineffective” mean?
Not having the desired effect; ineffectual; otiose.
Is “ineffective” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.